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Adaptive modulation coding method

A technology of adaptive modulation and modulation coding, applied in the field of wireless communication, can solve problems such as slowness, unstable changes in adaptive adjustment reference quantities, frequent adaptive adjustments, etc.

Inactive Publication Date: 2010-12-29
ZTE CORP
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an adaptive modulation and encoding method to solve the problem of too frequent or too slow adaptive adjustment due to unstable changes in the adaptive adjustment reference quantity

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Embodiment Construction

[0015] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The main idea of ​​the present invention is: the network side counts the received parameter values ​​that identify channel conditions, and obtains the difference between the two parameter values ​​that identify channel conditions before and after;

[0017] Calculate the received parameter value identifying the channel condition according to the statistical result of the difference obtained in a period of time to obtain an average parameter value identifying the channel condition, and calculate the obtained average parameter value identifying the channel condition number;

[0018] Judging that if the number of received average parameter values ​​identifying channel conditions reaches the initial value of the processing rising statistical window, then the obtained average parameter values ​​identifying channel conditions are modulated one...

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Abstract

The invention relates to an adaptive modulation coding method, comprising the following steps: a network side carries out statistics on parameter value of received identification channel conditions, obtains difference of the parameter value, carries out computing on the statistical result of the difference obtained in a period of time, obtains the parameter value of the average identification channel condition and obtains the number of the parameter values of the average identification channel condition according to statistics; the network side judges if the number of the parameter values obtained according to statistics reaches the initial value for processing an ascending statistical window, then the parameter value of the average identification channel condition is compared one by one with the threshold value of the modulation coding mode one order higher than the current modulation coding mode; if the number of the parameter values of the average identification channel condition of the threshold value of the modulation coding mode one order higher reaches the preset first limiting value according to the statistics and judgment, then the modulation coding mode is adjusted one order higher. By the method of the invention, the problem of excessively frequent or excessively slow adaptive modulation caused by unstable change of adaptive modulation reference quantity is solved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an adaptive modulation and encoding method. Background technique [0002] The wireless channel is a channel with time-varying and fading characteristics. If fixed transmission parameters are used for data transmission, the system performance will definitely be unstable. In order to stabilize the performance of the system to the greatest extent, only the transmission parameter can be changed to a quantity that changes with the channel parameter. This process of changing transmission parameters as the channel changes is called link adaptation, and both power control and Adaptive Modulation and Coding (AMC, Adaptive Modulation and Coding) technologies belong to link adaptation technologies. [0003] Adaptive modulation and coding technology has been widely used in B3G and 4G technologies, and has been identified as one of the key technologies to improve system performance. Th...

Claims

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Application Information

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IPC IPC(8): H04W28/04H04W52/00
Inventor 刘颖
Owner ZTE CORP
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